# Relationship history for MSHA mine 1300353

Current hierarchy: **United Brick & Tile Co Of Iowa → United Brick & Tile Co Of Iowa → Clay Pit No 6**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** United Brick & Tile Co Of Iowa → Clay Pit No 6; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** United Brick & Tile Co Of Iowa → Clay Pit No 6; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United Brick & Tile Co Of Iowa → United Brick & Tile Co Of Iowa; 1950-01-01 to current/open; source msha-controller-operator-history